I am postmenopausal with bleeding. The doc can't see any coming from my cervix. The blood is high in my vagina. Where else could it be coming from?

Post menopausal. It could be from the vagina itself if you're still sexually active, but its most likely intermittent from inside the uterine cavity or cervix. Either an ultrasound of the pelvis and/or endometrial biopsy is warranted here.